Catalyst monitoring using a hydrocarbon sensor

Details Catalyst monitoring using a hydrocarbon sensor Catalyst monitoring using a hydrocarbon sensor

1991-09-04

1995-04-18

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

731181, 60278, 36443103, B60Q 100

Patent

active

054082153

ABSTRACT:
An on-board monitoring system for an automotive emission catalyst [having] has (i) a test chamber remote from the automobile's engine exhaust gas stream; (ii) [means] apparatus for supplying the chamber with sampled exhaust gases sequestered from said stream; (iii) a single hydrocarbon sensor exposed to the exhaust gas in the chamber to render a signal responsive to the concentration of hydrocarbon in the chamber; and (iv) [means] apparatus for comparing the sensed signal with a reference signal, and, if a predetermined difference is exceeded, the catalyst is indicated as faulty. [Means (ii) may have] Apparatus (ii) has a supply channel interconnected between the chamber and the gas stream upstream of the catalytic converter, a supply channel independently interconnected between the chamber and the gas stream downstream of the catalytic converter, and valve [means] apparatus for permitting flow-through of no more than one channel to said chamber at any one moment, preferably cycled at a certain frequency. Method steps Carried Out by the System comprise: [A method of on-board monitoring of an automotive vehicle catalyst, comprising:] (a) periodically transferring a sample quantity of gas from the stream into a test chamber at a predetermined flow rate; (b) exposing a hydrocarbon sensor to the sequestered gas to generate a signal in proportion to the content of hydrocarbon in such gas; and (c) comparing the signal with a reference signal to determine if a predetermined difference exists and thereby conclude the catalyst is sufficiently degraded.

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